1. Search for other homes in the MLS for the same community. Do those listings state the home is in an HOA? While this is one of the quickest ways it’s not an absolute. The information may not be reliable, up-to-date, or accurate. Even worse the other agent(s) may not know either.
  2. Try searching the Arizona Corporation Commission here:
    https://ecorp.azcc.gov/EntitySearch/Index